Shisha system with a heating unit comprising two electrodes

Abstract

A shisha system comprising an aerosol-generating article (90) and a shisha device (50). The aerosol-generating article (90) comprises an aerosol-forming substrate (92). The shisha system further comprises a first electrode (15) and a second electrode (16). The shisha device (50) comprises a liquid cavity (54) configured to contain a volume of liquid, the liquid cavity (54) having a head space outlet (60); an article cavity (14) configured to receive an aerosol-forming substrate (92), the article cavity (14) being in fluid communication with the liquid cavity (54). The shisha device further comprises an oscillation circuit (10) configured for connection to the first electrode (15) and the second electrode (16). The oscillation circuit (10) is configured to supply a radio frequency (RF) alternating voltage to the first electrode (15) and the second electrode (16), the RF voltage between the first electrode (15) and the second electrode (16) generating an alternating radio frequency (RF) electromagnetic field between the first electrode (15) and the second electrode (16) for heating the aerosol-forming substrate (92) when the aerosol-generating article (90) is received in the article cavity (14).

The invention claimed is: 
     
       1. A shisha system comprising:
 an aerosol-generating article comprising an aerosol-forming substrate; 
 a first electrode and a second electrode; and 
 a shisha device comprising:
 a liquid cavity configured to contain a volume of liquid, the liquid cavity having a head space outlet; 
 an article cavity configured to receive the aerosol-forming article, the article cavity being in fluid communication with the liquid cavity; and 
 an oscillation circuit configured for connection to the first electrode and the second electrode, 
 
 wherein the oscillation circuit is configured to supply a radio frequency (RF) alternating voltage to the first electrode and the second electrode, the RF voltage between the first electrode and the second electrode generating an alternating radio frequency (RF) electromagnetic field between the first electrode and the second electrode for heating the aerosol-forming substrate when the aerosol-generating article is received in the article cavity. 
 
     
     
       2. A shisha system as claimed in  claim 1 , wherein the first electrode and the second electrode are arranged to contact the aerosol-generating article when the aerosol-generating article is received in the article cavity. 
     
     
       3. A shisha system as claimed in  claim 1 , wherein the second electrode is spaced apart from the first electrode to receive at least a portion of the aerosol-forming substrate between the first electrode and the second electrode. 
     
     
       4. A shisha system as claimed in  claim 1 , wherein the shisha device comprises the first electrode and the second electrode, and the first electrode and the second electrode are arranged in or around the article cavity. 
     
     
       5. A shisha system as claimed in  claim 1 , wherein:
 the aerosol-generating article comprises the first electrode and the second electrode, at least a portion of the aerosol-forming substrate being disposed between the first electrode and the second electrode; 
 the shisha device comprises a first electrical contact for electrically connecting the first electrode to the oscillation circuit; and 
 the shisha device comprises a second electrical contact for electrically connecting the second electrode to the oscillation circuit. 
 
     
     
       6. A shisha system as claimed in  claim 1 , wherein:
 the shisha device comprises one of the first electrode and the second electrode; 
 the aerosol-generating article comprises the other one of the first electrode and the second electrode; and 
 the shisha device further comprises an electrical contact for electrically connecting the other one of the first electrode and the second electrode to the oscillation circuit. 
 
     
     
       7. A shisha system as claimed in  claim 1 , wherein one or more slots are formed in at least one of the first electrode and the second electrode. 
     
     
       8. A shisha system as claimed in  claim 1 , wherein the first electrode and the second electrode are substantially planar, and wherein the second electrode is arranged substantially parallel to the first electrode. 
     
     
       9. A shisha system as claimed in  claim 1 , wherein the first electrode is a tubular electrode, and wherein the second electrode is arranged within the tubular first electrode. 
     
     
       10. A shisha device comprising:
 a liquid cavity configured to contain a volume of liquid, the liquid cavity having a head space outlet; 
 an article cavity for receiving an aerosol-generating article, the article cavity being in fluid communication with the liquid cavity; 
 a first electrode and a second electrode, the first electrode and the second electrode being arranged in or around the article cavity; and 
 an oscillation circuit connected to the first electrode and the second electrode and configured to supply a radio frequency (RF) alternating voltage to the first electrode and the second electrode, the RF voltage between the first electrode and the second electrode generating an alternating radio frequency (RF) electromagnetic field between the first electrode and the second electrode for heating the aerosol-forming substrate when the aerosol-generating article is received in the cavity between the first electrode and the second electrode. 
 
     
     
       11. A shisha device comprising:
 a liquid cavity configured to contain a volume of liquid, the liquid cavity having a head space outlet; 
 an article cavity for receiving an aerosol-generating article, the article cavity being in fluid communication with the liquid cavity; 
 a first electrode arranged in or around the article cavity; 
 an electrical contact arranged in or around the article cavity for electrical connection to a second electrode, when an aerosol-generating article comprising a second electrode is received in the article cavity; and 
 an oscillation circuit connected to the first electrode and the electrical contact and configured to supply a radio frequency (RF) alternating voltage to the first electrode and the electrical contact. 
 
     
     
       12. A shisha device comprising:
 a liquid cavity configured to contain a volume of liquid, the liquid cavity having a head space outlet; 
 an article cavity for receiving an aerosol-generating article, the article cavity being in fluid communication with the liquid cavity; 
 a first electrical contact arranged in or around the article cavity, and arranged for electrical connection to a first electrode received in the article cavity; 
 a second electrical contact arranged in or around the article cavity, and arranged for electrical connection to a second electrode received in the article cavity; and 
 an oscillation circuit connected to the first electrical contact and the second electrical contact, and configured to supply a radio frequency (RF) alternating voltage to the first electrical contact and the second electrical contact. 
 
     
     
       13. An aerosol-generating article for an electrically heated shisha system, the aerosol-generating article comprising:
 a first electrode and a second electrode spaced apart from the first electrode to form a substrate cavity; and 
 an aerosol-forming substrate disposed in the substrate cavity, wherein the aerosol-forming substrate is a shisha substrate comprising at least about 20 percent by weight of sugar. 
 
     
     
       14. An aerosol-generating article as claimed in  claim 13 , wherein the first electrode and the second electrode are substantially planar, and the second electrode is arranged substantially parallel to the first electrode. 
     
     
       15. An aerosol-generating article as claimed in  claim 13 , wherein the first electrode is a tubular electrode and the second electrode is disposed within the first electrode. 
     
     
       16. An aerosol-generating article as claimed in  claim 13 , wherein one or more slots are formed in at least one of the first electrode and the second electrode.